1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    *
5    *
6    *
7    * The contents of this file are subject to the terms of the Liferay Enterprise
8    * Subscription License ("License"). You may not use this file except in
9    * compliance with the License. You can obtain a copy of the License by
10   * contacting Liferay, Inc. See the License for the specific language governing
11   * permissions and limitations under the License, including but not limited to
12   * distribution rights of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.portlet.messageboards.util.comparator;
24  
25  import com.liferay.portal.kernel.util.DateUtil;
26  import com.liferay.portlet.messageboards.model.MBMessage;
27  
28  import java.io.Serializable;
29  
30  import java.util.Comparator;
31  
32  /**
33   * <a href="MessageThreadComparator.java.html"><b><i>View Source</i></b></a>
34   *
35   * @author Brian Wing Shun Chan
36   */
37  public class MessageThreadComparator
38      implements Comparator<MBMessage>, Serializable {
39  
40      public int compare(MBMessage msg1, MBMessage msg2) {
41          Long parentMessageId1 = new Long(msg1.getParentMessageId());
42          Long parentMessageId2 = new Long(msg2.getParentMessageId());
43  
44          int value = parentMessageId1.compareTo(parentMessageId2);
45  
46          if (value == 0) {
47              value = DateUtil.compareTo(
48                  msg1.getCreateDate(), msg2.getCreateDate());
49          }
50  
51          if (value == 0) {
52              Long messageId1 = new Long(msg1.getMessageId());
53              Long messageId2 = new Long(msg2.getMessageId());
54  
55              value = messageId1.compareTo(messageId2);
56          }
57  
58          return value;
59      }
60  
61  }